Universal filter frame



FIG. 1 is a front perspective view of the universal filter frame;

FIG. 2 is a front view of the universal filter frame;

FIG. 3 is a rear view of the universal filter frame;

FIG. 4 is a top view of the universal filter frame;

FIG. 5 is a bottom view of the universal filter frame;

FIG. 6 is a side view of the universal filter frame; and,

FIG. 7 is an opposite side view of the universal filter frame.

The portions shown in broken lines in FIGS. 1–7 depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for a universal filter frame, as shown and described. 